Clematis has a large amount of early and late flowers, different varieties have different flowering time. Generally, it can bloom twice a year. The first flowering period of early flowering varieties is from April to may, and the second flowering period is from August to October.
The first florescence of late flowering varieties was from May to June, and the second florescence was from August to October. If the proper artificial regulation of its breeding environment, then it can bloom in January to February in winter.
If you want it to produce more flowers, you must apply enough fertilizer. It needs a relatively large amount of fertilizer, especially before flowering, so we must often fertilize it to provide the nutrients it needs for flowering.